[백준 11660] 구간 합 구하기 5

🔗 문제

https://www.acmicpc.net/problem/11660

11660번: 구간 합 구하기 5

 

💻 코드 

package org.kyhslam.bakjun;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.Scanner;
import java.util.StringTokenizer;

public class p11660 {

    public static void main(String[] args) throws Exception {

        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringTokenizer st = new StringTokenizer(br.readLine());

        int N = Integer.parseInt(st.nextToken());
        int M = Integer.parseInt(st.nextToken());
        //int N = 4;
        //int M = 3;

        System.out.println("N = " + N);
        System.out.println("M = " + M);

        int[][] A = new int[N + 1][N + 1];
/*
        int[][] A = {
                {0, 0, 0, 0, 0},
                {0, 1, 2, 3, 4},
                {0, 2, 3, 4, 5},
                {0, 3, 4, 5, 6},
                {0, 4, 5, 6, 7}
        };
*/

        for (int i = 1; i <= N; i++) {
            st = new StringTokenizer(br.readLine());
            for (int j = 1; j <= N; j++) {
                A[i][j] = Integer.parseInt(st.nextToken());
            }
        }


        System.out.println("Arrays.toString(A) = " + Arrays.deepToString(A));
        arrView(A);

        //구간의 합
        int[][] D = new int[N + 1][N + 1];
        for (int i = 1; i <= N; i++) {
            for (int j = 1; j <= N; j++) {
                D[i][j] = D[i][j - 1] + D[i - 1][j] - D[i - 1][j - 1] + A[i][j];
            }
        }
        arrView(D);

        for (int i = 0; i < M; i++) {
            st = new StringTokenizer(br.readLine());
            int x1 = Integer.parseInt(st.nextToken());
            int y1 = Integer.parseInt(st.nextToken());
            int x2 = Integer.parseInt(st.nextToken());
            int y2 = Integer.parseInt(st.nextToken());

            int result = D[x2][y2] -D[x1-1][y2] - D[x2][y1-1] + D[x1-1][y1- 1];
            System.out.println("result = " + result);
        }
    }


    // index 1부터 시작
    public static void arrView(int[][] arr) {
        System.out.println("-- arrView start -- ");
        for (int i = 1; i < arr.length; i++) {
            for (int j = 1; j < arr[i].length; j++) {
                System.out.print(arr[i][j] + " ");
            }
            System.out.println("");
        }
        System.out.println("-- arrView end -- ");
    }
}